From the Super Mario Wiki, the Mario encyclopedia
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The Stamp Card is a special item in Paper Mario: The Origami King. It is to be collected from the receptionist at the front desk of Shangri-Spa, requiring 1,000 coins for a donation. He introduces Mario and Olivia to their new campaign involving the Stamp Card. After Mario collects all four stamps throughout Shangri-Spa, the Stamp Card must be taken back to the front desk to get a prize. Mario is only able to get a stamp after he uses a hot spring, and can only use a stamp station once. If the hot spring is unavailable, Mario must remedy it before it can be used and stamped. After Mario collects all four stamps, he must return to the front desk and speak to the receptionist to receive the Spring of Rainbows - VIP card, a ticket to the Spring of Rainbows.
There was a glitch involving the Stamp Card and the Spring of Rainbows - VIP. If Mario was to collect the Stamp Card from the receptionist, unlock the Spring of Rainbows, and return to the front desk and speak to the receptionist, he asks for the Stamp Card, which the player no longer has in their inventory. In addition, they are now locked out of the Spring of Rainbows, softlocking the game. This glitch has since been patched.